Stephen Mandel, Jr.

Rank: 11
Firm: Lone Pine Capital
Earnings: $350 million
Mandel, 57, returned to crushing the markets in 2012, with all of his funds ending the year up more than 22% net. His $23 billion hedge fund firm, Lone Pine Capital, was named for a mythical Dartmouth College pine tree that survived an 1887 lighting strike. The Goldman Sachs and Tiger Management alumnus scored big in 2012 with stakes in fashion retailers including Michael Kors and The Gap.